Memory leaks during re-creating NaCl modules

This patch fixes one of three memory leaks found when page reloads
NaCl module(s).

In PepperPluginInstanceImpl ctor
FrameHostMsg_DidCreateInProcessInstance message is sent to browser
process, however message FrameHostMsg_DidDeleteInProcessInstance
isn't sent from dtor.  This is because PepperPluginInstanceImpl
is created for unproxied module and later reinitialized as proxied
one, which causes that
PepperBrowserConnection::DidCreateInProcessInstance method is
called in PepperPluginInstanceImpl ctor, however
PepperBrowserConnection::DidDeleteInProcessInstance isn't called in
PepperPluginInstanceImpl dtor.

Bug: 922925
Change-Id: Ifb80108a99f591e7d30ec8013e94cef6d176eca3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1679692
Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
Reviewed-by: Bill Budge <bbudge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689031}
2 files changed